PHP version compatibility

Hi All, I just wanted to know what versions of nusoap work with what version of PHP? I downloaded some examples off a website and tried to use them on my kubuntu box which has PHP 5 on it. It kept on giving me the error Fatal error: Cannot redeclare class soapclient in /home/junaid/www/nusoap.php on line 7191 when i tried the same code on a windows box with PHP 4 it worked without any problems. any hints? -- "Windows [n.] A thirty-two bit extension and GUI shell to a sixteen bit patch to an eight bit operating system originally coded for a four bit microprocessor and sold by a two-bit company that can't stand one bit of competition."